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Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part

An annealing process and cold-rolled steel technology, which is applied in the field of heat treatment, can solve problems affecting the surface quality of stamping parts, cracking of cold-rolled steel plates, scrapping of stamping parts, etc., and achieve the effects of improving deformation, stamping forming, and increasing ductility and plasticity Effect

Inactive Publication Date: 2011-04-20
CHANGAN AUTOMOBILE (GRP) CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

When the cold-rolled steel plate 30CrMnSiA is required to be stamped into parts with more complex shapes, the above-mentioned several annealing processes cannot meet the requirements, and the cold-rolled steel plate often has local cracking in stamping, which seriously affects the surface quality of the stamped parts. Even cause scrapping of stamping parts

Method used

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  • Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part
  • Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part
  • Three-stage temperature annealing process for 30CrMnSiA cold rolled steel part

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Embodiment 1

[0014] Part name: large box base, material: 30CrMnSiA, raw material state: cold-rolled steel plate. After three stamping processes, the parts are formed into the final part shape from the raw material cold-rolled steel plate. The technical requirements are: the bottom plane of the part is ≤0.30mm, and the flatness of the upper surface is ≤0.30mm. The inner cavity height is 27.2mm, the upper deviation is 0.28mm, and the lower deviation is 0mm. The inner cavity width is 95.5mm, the upper deviation is 0.87mm, the lower deviation is 0mm, the part length is 630mm, and the part thickness is 6mm.

[0015] Firstly, the raw material steel plate (raw material length 630mm, width 204mm, thickness 6mm) that has been cut and cut is put into a container, and the container is put into a low-vacuum well-type gas-protected resistance furnace, and the well-type resistance furnace starts to evacuate to 0.1Mpa, stop vacuuming, pass in nitrogen (purity above 99.95%), the electric furnace starts h...

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Abstract

The invention relates to a three-stage temperature annealing process for a 30CrMnSiA cold rolled steel part, which is realized at three different temperature stages, i.e. ferrite and cementite diffuse at the first-stage temperature of 650 DEG C, austenite nucleates and grows up at the second-stage temperature of 800-810 DEG C, and the austenite is converted into the ferrite and a carbide which is further relocated and diffused to form a spherical carbide at the third-stage temperature of 660-670 DEG C; and the aim of improving the deformation of a 30CrMnSiA cold rolled steel plate is achieved by the three-stage temperature. For the same material and rolled steel in the same furnace, compared with the traditional annealing process, the annealing process can further improve the plastic deformation and the elongation percentage of the 30CrMnSiA cold rolled steel plate during punching and can reduce the punching cracks of the steel plate.

Description

Technical field: [0001] The invention relates to heat treatment technology, in particular to a heat treatment annealing process for parts made of 30CrMnSiA low-alloy structural steel cold-rolled plates. On the same material and the same furnace steel, the process can significantly improve the plastic deformation and elongation of cold-rolled steel plates, reduce Stamping cracking of steel plate. Background technique: [0002] The existing heat treatment annealing process is divided into: diffusion annealing (temperature Ac3+150℃~200℃), complete annealing (temperature Ac3+30℃~50℃), incomplete annealing (temperature Ac1+40℃~60℃), isothermal Annealing (hypoeutectoid steel temperature Ac3+30℃~50℃; eutectoid steel and hypereutectoid steel temperature Ac1+20℃~40℃), spheroidizing annealing (temperature Ac1+20℃~40℃ or Accm+20℃ ~30°C), recrystallization annealing or intermediate annealing (temperature Ac1-50°C~150°C), stress relief annealing (temperature Ac1-100°C~200°C). The conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/04C21D1/26C21D11/00
Inventor 付在再
Owner CHANGAN AUTOMOBILE (GRP) CO LTD
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